1. Seven ancient wonders of the world:

1. pyramid of khufu, Egypt-Egypt

2. The colossus of Zeus at Olympia-Greece

3. The Temple of Artemis-Turkey

4. Mausoleum of Mo Thrym-Greece

5. The Lighthouse of Alexandria-Egypt

. The Seven Wonders of the World in the Middle Ages

1) The Colosseum in Italy

2) The underground tomb of Alexander on the edge of Libyan desert

3) The Great Wall of Wan Li in China

4) The Stone Enclosure in Britain

5) The Coloured Pagoda of Hoonji in Nanjing, China

6) The Leaning Tower of Pisa in Italy

7) Sophia Cathedral in Turkey

. Seven natural wonders in the world

1) Colorado Grand Canyon

2) Victoria Falls in Africa

3) Glacier Bay in Alaska

4) Mamma Cave in Kentucky, USA

5) Mount Everest, the highest peak in the world

6) Lake Baikal, the deepest lake in the world (now in Russia)

7) Yellowstone National Park, USA.

2) Jojobank Astronomical Telescope (UK): This is the largest radio telescope in the world, with a curved reflecting surface 25 feet wide, which can receive signals from aliens.

3) Golden Gate Bridge (USA): It connects San Francisco and Marin County, with a total length of 4,2 feet. Two main cables carry 8, miles of wires.

4) Panama Canal (Panama): It bisects the isthmus of Panama and is 5 miles long. In order to dig the canal and connect the Atlantic Ocean and the Pacific Ocean, no less than 2 million tons of soil and sand have been dug up.

5) Sputnik-1 spacecraft (former Soviet Union): This is the first artificial satellite launched into space. Weighing 23 pounds, it orbits the earth once every 96 minutes until it is exhausted in the atmosphere.

6) Hoover Dam (USA): It is located between Nevada and Arizona, with a length of 379 meters and a height of 221 meters. Its 247-square-mile storage tank can hold 1 megabytes of added water.

7) Nautilus Atomic Submarine (USA): This is the first atomic submarine in the world. In 1958, it sailed across the pole under the Arctic ice.